Small molecule host system for solution-processed red phosphorescent OLEDs

We demonstrate high efficiency solution-processed red phosphorescent OLEDs with small molecule mixed host systems. 2-TNATA (4,4′,4″-tris(N-(2-naphthyl)-N-phenyl-amino)triphenylamine):TPBI (2,2′,2″-(1,3,5-phenylene)tris(1-phenyl-1H-benzimidazole)) and m-MTDATA (4,4′,4″-tri-(N-3-methylphenyl-N-phenyla...

Full description

Saved in:
Bibliographic Details
Published in:Synthetic metals 2010-04, Vol.160 (7), p.631-635
Main Authors: Kim, Kyeong Heon, Lee, Jae Yeol, Park, Tae Jin, Jeon, Woo Sik, Kennedy, G.P., Kwon, Jang Hyuk
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Host
OLED
Optoelectronic devices
Phosphorescent
Red
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We demonstrate high efficiency solution-processed red phosphorescent OLEDs with small molecule mixed host systems. 2-TNATA (4,4′,4″-tris(N-(2-naphthyl)-N-phenyl-amino)triphenylamine):TPBI (2,2′,2″-(1,3,5-phenylene)tris(1-phenyl-1H-benzimidazole)) and m-MTDATA (4,4′,4″-tri-(N-3-methylphenyl-N-phenylamino)triphenylamine):TPBI host systems are reported as good soluble mixed host systems. A doping level of 3% bis(2-phenylquinoline)(acetylacetonate)iridium (Ir(phq) 2acac) dopant in the 2-TNATA:TPBI (1:1 ratio) mixed host produces the best quantum efficiency and driving voltage. This fabricated red phosphorescent OLED has a driving voltage of 5.2 V and maximum current and power efficiencies of 17.8 cd/A and 11.3 lm/W, respectively. Minimal electron or hole trapping in the phosphorescent dopant molecules and prevention of self quenching by the low doping technique appear to be the key reasons for good device performance.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2009.12.020